Often times I talk about echolocation as requiring the use of a mouth click or tongue click, however, the only thing that echolocation requires is some sort of sound. There are a myriad of sounds around us all the time, both acute sound events (like a click, pop, footstep, words, etc.) and ambient sounds, like wind or appliances. All of these sounds undergo many reflections bouncing off of all of the objects around us before making it to our ears. If you have been without vision for some time, you are no stranger to the subtleties of sounds. Many people claim to glean information about their surroundings by tapping their cane on the ground. This tapping sound is something one becomes very familiar with and can be a very effective sound for use with echolocation. Whether you can learn a little bit about your environment, (like what size room you are in) or a lot about your environment, (like what type of furniture is around you, or where a doorway is located) you are using some amount of echolocation.
If this is a strategy you use for mobility, you undoubtedly understand the benefits of this mode of perception. Now is the time to explore the fundamentals of echolocation even further to see how much you can improve this perception. The reason echolocation is taught using mouth clicks is simply because the sound emitted from your mouth is very close to your ears, which means that the sound is basically travelling in a straight line out from your head and directly back to your head. This helps to control the signal better and eliminate various sound reflections that may occur when the sound is emitted from other places, like your snapping fingers or the tip of your cane.
It's important to mention here that there are actually benefits to using a signal that originates a the tip of your cane or your hand, to the effect that it can enable you to see objects in your periphery if done properly. For more information on how you can implement the principles of echolocation in addition to the use of your cane, please take a look at the website (www.HumanEcholocation.com) and read about the book, Beginner's Guide to Echolocation.